US20060117524A1 - Structure of a shock absorbing caster - Google Patents

Structure of a shock absorbing caster Download PDF

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Publication number
US20060117524A1
US20060117524A1 US11/004,941 US494104A US2006117524A1 US 20060117524 A1 US20060117524 A1 US 20060117524A1 US 494104 A US494104 A US 494104A US 2006117524 A1 US2006117524 A1 US 2006117524A1
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United States
Prior art keywords
rotary support
fork
shock absorbing
furniture
elastic element
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Abandoned
Application number
US11/004,941
Inventor
Li-Lan Yan
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Individual
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Individual
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Publication date
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Priority to US11/004,941 priority Critical patent/US20060117524A1/en
Publication of US20060117524A1 publication Critical patent/US20060117524A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B33/00—Castors in general; Anti-clogging castors
    • B60B33/04—Castors in general; Anti-clogging castors adjustable, e.g. in height; linearly shifting castors
    • B60B33/045—Castors in general; Anti-clogging castors adjustable, e.g. in height; linearly shifting castors mounted resiliently, by means of dampers

Definitions

  • the present invention relates to a shock absorbing caster, more particularly one, which is structured in such a way that upward and downward jolts of a piece of furniture, which is equipped with the caster, can be effectively reduced while the furniture is being moved along a rugged land.
  • a conventional shock absorbing caster includes a connecting part 10 , a rotary support 20 , a fork 30 , a wheel 301 , and an elastic element 40 .
  • the connecting part 10 is secured to a bottom of a piece of furniture such as a trolley.
  • the rotary support 20 is connected to the connecting part 10 so as to be capable of turning.
  • the fork 30 is pivoted to the rotary support 20 while the wheel 301 is connected to the fork 30 .
  • the elastic element 40 is pressed against the rotary support 20 at one end, and the fork 30 at the other.
  • the elastic element 40 will be compressed to help reduce violent downward jolt of the furniture while the furniture is being moved along a rugged land.
  • another conventional shock absorbing caster includes a connecting part 10 , a rotary support 20 , a fork 30 , a wheel 301 , a pair of arms 50 , and a pair of shock absorbing members 60 , which can be elastic elements or hydraulic shock absorbers.
  • the connecting part 10 is secured to a bottom of a piece of furniture such as a trolley.
  • the rotary support 20 is connected to the connecting part 10 so as to be capable of turning.
  • the fork 30 is pivoted to the rotary support 20 while the wheel 301 is connected to the fork 30 .
  • the arms 50 are respectively pivoted to two lateral sides of the rotary support 20 , and each has a pivotal protrusion 501 .
  • the shock absorbing members 60 are pivoted to respective ones of the protrusions 501 of the arms 50 at upper ends thereof, and they are connected to an axle of the wheel 301 in an angularly displaceable manner. Therefore, the shock absorbing members 60 will be compressed to absorb violent downward jolt of the piece of furniture while the furniture is being moved along a rugged land.
  • the elastic element 40 and the shock absorbing members 60 can only reduce violent downward jolt of the furniture, which will occur while the caster is moving downward from an upper edge of a cavity of a rugged land to the bottom of the cavity; the elastic element 40 and the shock absorbing members 60 will stretch from the compressed position and release the power stored therein during the course of the casters moving upwards from a bottom of a cavity to an upper edge of the cavity, thus causing even more violent upward jolt of the furniture instead of reducing the jolt. Consequently, the furniture can get damaged, and the objects held thereon can fall over.
  • the caster of the present invention includes a connecting part, a rotary support, a fork, a wheel, and upper and lower springs, and a connecting stick, which upper and lower springs are respectively used for reducing upward and downward jolts of a piece of furniture equipped with the caster.
  • the connecting part is secured to a bottom side of a piece of furniture.
  • the rotary support is arranged under and connected to the connecting part while the fork is arranged under and pivoted to the rotary support.
  • the wheel is connected to the fork.
  • the lower spring is positioned under an upper portion of the fork while the upper spring is positioned between the upper portion of the fork and the rotary support.
  • the connecting stick is passed through the lower spring, the upper portion of the fork, and the upper spring in sequence, and securely connected to the rotary support at an upper end.
  • FIG. 1 is a perspective view of the first conventional caster
  • FIG. 2 is a vertical section of the first conventional caster
  • FIG. 3 is a vertical section of the first conventional caster, moving on a rugged land
  • FIG. 4 is an exploded perspective view of the second conventional shock absorbing caster
  • FIG. 5 is a vertical section of the second conventional caster
  • FIG. 6 is an exploded perspective view of the present caster
  • FIG. 7 is a vertical section of the present caster
  • FIG. 8 is a vertical section of the present caster in motion
  • FIG. 9 is a vertical section of the present caster, with the brake mechanism being in the depressed in-use position.
  • a preferred embodiment of a shock absorbing caster of the invention includes a connecting part 1 , a rotary support 2 , a fork 3 , a wheel 4 , an upper elastic element 5 , a lower elastic element 6 , a connecting stick 7 , and a brake mechanism 8 .
  • the connecting part 1 is secured to a bottom of a piece of furniture such as a trolley.
  • the rotary support 2 is connected to the connecting part 1 so as to be capable of turning, and it has a pivotal portion 21 at one end, and a through hole 22 extending from an upper side to a lower side of the other end.
  • the fork 3 has a pivotal portion 31 at one end, and a slot 32 extending from an upper side to a lower side of the other end.
  • the fork 3 is pivoted to the pivotal portions 21 of the rotary support 2 at the pivotal portion 31 thereof while the wheel 4 is connected to the fork 3 .
  • the connecting stick 7 has a rim 72 at a lower end, and screw threads at an upper end thereof, and it is passed through the lower elastic element 6 , the slot 32 of the fork 3 , the upper elastic element 5 , and the through hole 22 of the rotary support 2 in sequence, and screwed into a nut 71 ; thus, the lower elastic element 6 is pressed against the rim 72 and the upper portion of the fork 3 at two ends thereof while the upper elastic element S is pressed against the rotary support 2 and the upper portion of the fork 3 at two ends thereof.
  • the brake mechanism 8 is pivoted to the pivotal portion 31 of the fork 3 such that it can be forced to touch the wheel 4 for making the wheel incapable of turning.
  • the lower elastic element 6 will be compressed to reduce violent downward jolt of the furniture.
  • the lower elastic element 6 will stretch from the compressed position and release the power stored therein, and the upper elastic element 5 will be compressed so as to counteract the lower elastic element 6 , thus reducing violent upward jolts of the furniture. Consequently, the furniture can move along a rugged land with reduced risk of objects held thereon getting damaged or falling over.
  • the shock absorbing caster of the invention has an advantage: besides having the lower elastic element 6 for reducing violent downward jolt of the furniture, the caster is equipped with the upper elastic element 5 , which can reduce a violent upward jolt occurring while the furniture is being moved along a rugged land. Therefore, the present caster is more ideal than the conventional ones described in Background.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Legs For Furniture In General (AREA)

Abstract

A caster includes a connecting part, a rotary support, a fork, a wheel, upper and lower springs, and a connecting stick; the connecting part is secured to a bottom side of a piece of furniture; the rotary support is arranged under and connected to the connecting part; the fork is arranged under and pivoted to the rotary support while the wheel is connected to the fork; the lower spring is positioned under an upper portion of the fork while the upper spring is positioned between the upper portion of the fork and the rotary support; the connecting stick is passed through the lower spring, the upper portion of the fork, and the upper spring in sequence, and securely connected to the rotary support at an upper end; thus, the upper and the lower springs will reduce upward and downward jolts respectively while the furniture is being moved along a rugged land.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the invention
  • The present invention relates to a shock absorbing caster, more particularly one, which is structured in such a way that upward and downward jolts of a piece of furniture, which is equipped with the caster, can be effectively reduced while the furniture is being moved along a rugged land.
  • 2. Brief Description of the Prior Art
  • Referring to FIGS. 1 to 3, a conventional shock absorbing caster includes a connecting part 10, a rotary support 20, a fork 30, a wheel 301, and an elastic element 40.
  • The connecting part 10 is secured to a bottom of a piece of furniture such as a trolley. The rotary support 20 is connected to the connecting part 10 so as to be capable of turning. The fork 30 is pivoted to the rotary support 20 while the wheel 301 is connected to the fork 30. The elastic element 40 is pressed against the rotary support 20 at one end, and the fork 30 at the other.
  • Thus, the elastic element 40 will be compressed to help reduce violent downward jolt of the furniture while the furniture is being moved along a rugged land.
  • Referring to FIGS. 4 and 5, another conventional shock absorbing caster includes a connecting part 10, a rotary support 20, a fork 30, a wheel 301, a pair of arms 50, and a pair of shock absorbing members 60, which can be elastic elements or hydraulic shock absorbers.
  • The connecting part 10 is secured to a bottom of a piece of furniture such as a trolley. The rotary support 20 is connected to the connecting part 10 so as to be capable of turning. The fork 30 is pivoted to the rotary support 20 while the wheel 301 is connected to the fork 30. The arms 50 are respectively pivoted to two lateral sides of the rotary support 20, and each has a pivotal protrusion 501. The shock absorbing members 60 are pivoted to respective ones of the protrusions 501 of the arms 50 at upper ends thereof, and they are connected to an axle of the wheel 301 in an angularly displaceable manner. Therefore, the shock absorbing members 60 will be compressed to absorb violent downward jolt of the piece of furniture while the furniture is being moved along a rugged land.
  • However, the above casters are found to have a disadvantage: the elastic element 40 and the shock absorbing members 60 can only reduce violent downward jolt of the furniture, which will occur while the caster is moving downward from an upper edge of a cavity of a rugged land to the bottom of the cavity; the elastic element 40 and the shock absorbing members 60 will stretch from the compressed position and release the power stored therein during the course of the casters moving upwards from a bottom of a cavity to an upper edge of the cavity, thus causing even more violent upward jolt of the furniture instead of reducing the jolt. Consequently, the furniture can get damaged, and the objects held thereon can fall over.
    • SUMMARY OF THE INVENTION
  • It is a main object of the invention to provide an improvement on a shock absorbing caster to overcome the above disadvantage.
  • The caster of the present invention includes a connecting part, a rotary support, a fork, a wheel, and upper and lower springs, and a connecting stick, which upper and lower springs are respectively used for reducing upward and downward jolts of a piece of furniture equipped with the caster. The connecting part is secured to a bottom side of a piece of furniture. The rotary support is arranged under and connected to the connecting part while the fork is arranged under and pivoted to the rotary support. The wheel is connected to the fork. The lower spring is positioned under an upper portion of the fork while the upper spring is positioned between the upper portion of the fork and the rotary support. And, the connecting stick is passed through the lower spring, the upper portion of the fork, and the upper spring in sequence, and securely connected to the rotary support at an upper end.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The present invention will be better understood by referring to the accompanying drawings, wherein:
  • FIG. 1 is a perspective view of the first conventional caster,
  • FIG. 2 is a vertical section of the first conventional caster,
  • FIG. 3 is a vertical section of the first conventional caster, moving on a rugged land,
  • FIG. 4 is an exploded perspective view of the second conventional shock absorbing caster,
  • FIG. 5 is a vertical section of the second conventional caster,
  • FIG. 6 is an exploded perspective view of the present caster,
  • FIG. 7 is a vertical section of the present caster,
  • FIG. 8 is a vertical section of the present caster in motion, and
  • FIG. 9 is a vertical section of the present caster, with the brake mechanism being in the depressed in-use position.
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • Referring to FIGS. 6 and 9, a preferred embodiment of a shock absorbing caster of the invention includes a connecting part 1, a rotary support 2, a fork 3, a wheel 4, an upper elastic element 5, a lower elastic element 6, a connecting stick 7, and a brake mechanism 8.
  • The connecting part 1 is secured to a bottom of a piece of furniture such as a trolley.
  • The rotary support 2 is connected to the connecting part 1 so as to be capable of turning, and it has a pivotal portion 21 at one end, and a through hole 22 extending from an upper side to a lower side of the other end.
  • The fork 3 has a pivotal portion 31 at one end, and a slot 32 extending from an upper side to a lower side of the other end. The fork 3 is pivoted to the pivotal portions 21 of the rotary support 2 at the pivotal portion 31 thereof while the wheel 4 is connected to the fork 3.
  • The connecting stick 7 has a rim 72 at a lower end, and screw threads at an upper end thereof, and it is passed through the lower elastic element 6, the slot 32 of the fork 3, the upper elastic element 5, and the through hole 22 of the rotary support 2 in sequence, and screwed into a nut 71; thus, the lower elastic element 6 is pressed against the rim 72 and the upper portion of the fork 3 at two ends thereof while the upper elastic element S is pressed against the rotary support 2 and the upper portion of the fork 3 at two ends thereof. The brake mechanism 8 is pivoted to the pivotal portion 31 of the fork 3 such that it can be forced to touch the wheel 4 for making the wheel incapable of turning.
  • Therefore, while the caster is moving downwards from an upper edge of a cavity of a rugged land to a bottom of the cavity, the lower elastic element 6 will be compressed to reduce violent downward jolt of the furniture. And, while the caster is moving upwards from a bottom of a cavity of a rugged land to an upper edge of the cavity, the lower elastic element 6 will stretch from the compressed position and release the power stored therein, and the upper elastic element 5 will be compressed so as to counteract the lower elastic element 6, thus reducing violent upward jolts of the furniture. Consequently, the furniture can move along a rugged land with reduced risk of objects held thereon getting damaged or falling over.
  • From the above description, it can be easily understood that the shock absorbing caster of the invention has an advantage: besides having the lower elastic element 6 for reducing violent downward jolt of the furniture, the caster is equipped with the upper elastic element 5, which can reduce a violent upward jolt occurring while the furniture is being moved along a rugged land. Therefore, the present caster is more ideal than the conventional ones described in Background.

Claims (5)

1. A shock absorbing caster, comprising a rotary support arranged under a bottom of a piece of furniture;
a fork member arranged under and pivoted to the rotary support;
a wheel connected to the fork member;
a lower elastic element positioned under an upper portion of the fork member;
an upper elastic element positioned between the upper portion of the fork member and the rotary support; and
a connecting stick; the stick being passed through the lower elastic element, the upper portion of the fork member, and the upper elastic element in sequence, and securely connected to the rotary support at an upper end for allowing the upper and the lower elastic elements to respectively reduce upward and downward jolts while the furniture is being moved along a rugged land.
2. The shock absorbing caster as claimed in claim 1 further having an upper part secured to the bottom of the furniture, to which the rotary support is connected.
3. The shock absorbing caster as claimed in claim 1 further having a brake mechanism pivoted to the fork member.
4. The shock absorbing caster as claimed in claim 1, wherein the upper portion of the fork member is formed with a slot thereon, through which the connecting stick is passed.
5. The shock absorbing caster as claimed in claim 1, wherein the connecting stick has a rim at a lower end, and a threaded upper end, which screwed into a nut on the rotary support, while the lower elastic element is pressed against the rim at a lower end.
US11/004,941 2004-12-07 2004-12-07 Structure of a shock absorbing caster Abandoned US20060117524A1 (en)

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Application Number Priority Date Filing Date Title
US11/004,941 US20060117524A1 (en) 2004-12-07 2004-12-07 Structure of a shock absorbing caster

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Application Number Priority Date Filing Date Title
US11/004,941 US20060117524A1 (en) 2004-12-07 2004-12-07 Structure of a shock absorbing caster

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080300115A1 (en) * 2007-05-29 2008-12-04 Sportcraft, Ltd. Rear mounted pivoting treadmill cushioning
US20090294432A1 (en) * 2006-05-11 2009-12-03 Yun-Geon Baek Cooktop, heater support device of cooktop, and heater support spring of cooktop
US20140109341A1 (en) * 2012-10-19 2014-04-24 Ross Design & Engineering, Inc. Vertically adjustable caster wheel apparatus
US20150174957A1 (en) * 2013-12-20 2015-06-25 Altoz, Inc Caster suspension system
CN106551490A (en) * 2017-01-20 2017-04-05 朱伟豪 A kind of roll wheel assembly and luggage case
CN108032681A (en) * 2017-12-29 2018-05-15 新乡市亿龙养护设备有限公司 A kind of road sweeper avoidance universal wheel
US9988065B2 (en) * 2015-08-20 2018-06-05 Wonderland Switzerland Ag Suspension system for absorbing a shock load and stroller therewith
US10118440B1 (en) * 2017-06-12 2018-11-06 Colson Caster Group, Llc Suspension caster with brake lever and wheel fork and yoke portion having common pivot axis
US10155415B1 (en) * 2017-12-13 2018-12-18 Kuo-Yu Lu Shockproof caster
CN114129365A (en) * 2021-11-15 2022-03-04 湖南辰康医药有限公司 Medical truckle support for medical sickbed
US11279173B2 (en) 2013-03-06 2022-03-22 Gatekeeper Systems, Inc. Wheels for non-motorized vehicles
US11547618B2 (en) * 2020-06-02 2023-01-10 Toyota Motor North America, Inc. Support devices including collapsible casters
US11975568B2 (en) * 2020-01-24 2024-05-07 Gatekeeper Systems, Inc. Self-adjusting caster assemblies

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2040121A (en) * 1935-04-10 1936-05-12 Charles Bond Shock absorbing caster
US2707795A (en) * 1951-07-28 1955-05-10 Faultless Caster Corp Spring caster
US2775313A (en) * 1953-11-17 1956-12-25 Lockheed Aircraft Corp Retractable caster with brake
US2832091A (en) * 1954-06-01 1958-04-29 Aerol Co Inc Spring attachment for casters
US3270367A (en) * 1965-10-18 1966-09-06 Loos Edward No bounce caster assembly
US4085479A (en) * 1977-05-31 1978-04-25 Barney Rodney L Tool for removal and replacement of caster springs
US4372569A (en) * 1980-08-08 1983-02-08 Otterson Robert C Single wheel trailer support
US4763910A (en) * 1985-08-23 1988-08-16 Jd-Technologie Ag Resiliently mounted, pivotable steering roll, especially for driverless vehicles
US5328000A (en) * 1991-10-29 1994-07-12 Saf-T-Loc, Inc. Foot actuated wheel brake
US5593461A (en) * 1993-01-22 1997-01-14 Metro Industries, Inc. Method of manufacturing a caster with a fouling-resistant bearing cup feature
US6336524B1 (en) * 1999-05-26 2002-01-08 Driessen Aircraft Holding B.V. Brake device with brake adjustment system
US6539578B1 (en) * 2000-06-15 2003-04-01 Algood Casters Limited Deflecting spring caster
US6543798B2 (en) * 2000-04-04 2003-04-08 Pride Mobility Products Corporation Anti-tip caster suspension for a wheelchair
US6607201B2 (en) * 2001-01-03 2003-08-19 Bill W. Marshburn Swivel wheel assembly with adjustable shock absorption

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2040121A (en) * 1935-04-10 1936-05-12 Charles Bond Shock absorbing caster
US2707795A (en) * 1951-07-28 1955-05-10 Faultless Caster Corp Spring caster
US2775313A (en) * 1953-11-17 1956-12-25 Lockheed Aircraft Corp Retractable caster with brake
US2832091A (en) * 1954-06-01 1958-04-29 Aerol Co Inc Spring attachment for casters
US3270367A (en) * 1965-10-18 1966-09-06 Loos Edward No bounce caster assembly
US4085479A (en) * 1977-05-31 1978-04-25 Barney Rodney L Tool for removal and replacement of caster springs
US4372569A (en) * 1980-08-08 1983-02-08 Otterson Robert C Single wheel trailer support
US4763910A (en) * 1985-08-23 1988-08-16 Jd-Technologie Ag Resiliently mounted, pivotable steering roll, especially for driverless vehicles
US5328000A (en) * 1991-10-29 1994-07-12 Saf-T-Loc, Inc. Foot actuated wheel brake
US5593461A (en) * 1993-01-22 1997-01-14 Metro Industries, Inc. Method of manufacturing a caster with a fouling-resistant bearing cup feature
US6336524B1 (en) * 1999-05-26 2002-01-08 Driessen Aircraft Holding B.V. Brake device with brake adjustment system
US6543798B2 (en) * 2000-04-04 2003-04-08 Pride Mobility Products Corporation Anti-tip caster suspension for a wheelchair
US6539578B1 (en) * 2000-06-15 2003-04-01 Algood Casters Limited Deflecting spring caster
US6607201B2 (en) * 2001-01-03 2003-08-19 Bill W. Marshburn Swivel wheel assembly with adjustable shock absorption

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090294432A1 (en) * 2006-05-11 2009-12-03 Yun-Geon Baek Cooktop, heater support device of cooktop, and heater support spring of cooktop
US20080300115A1 (en) * 2007-05-29 2008-12-04 Sportcraft, Ltd. Rear mounted pivoting treadmill cushioning
US20140109341A1 (en) * 2012-10-19 2014-04-24 Ross Design & Engineering, Inc. Vertically adjustable caster wheel apparatus
US8839487B2 (en) * 2012-10-19 2014-09-23 Ross Design & Engineering, Inc. Vertically adjustable caster wheel apparatus
US11279173B2 (en) 2013-03-06 2022-03-22 Gatekeeper Systems, Inc. Wheels for non-motorized vehicles
US20150174957A1 (en) * 2013-12-20 2015-06-25 Altoz, Inc Caster suspension system
US9988065B2 (en) * 2015-08-20 2018-06-05 Wonderland Switzerland Ag Suspension system for absorbing a shock load and stroller therewith
CN106551490A (en) * 2017-01-20 2017-04-05 朱伟豪 A kind of roll wheel assembly and luggage case
US10118440B1 (en) * 2017-06-12 2018-11-06 Colson Caster Group, Llc Suspension caster with brake lever and wheel fork and yoke portion having common pivot axis
WO2018231372A1 (en) * 2017-06-12 2018-12-20 Colson Caster Group, Llc Suspension caster with brake lever and wheel fork and yoke portion having common pivot axis
CN110709258A (en) * 2017-06-12 2020-01-17 科顺集团控股有限责任公司 Suspension caster with brake lever and fork having a common pivot axis and yoke portion
EP3638514A4 (en) * 2017-06-12 2021-01-20 Colson Group Holdings, LLC Suspension caster with brake lever and wheel fork and yoke portion having common pivot axis
US10155415B1 (en) * 2017-12-13 2018-12-18 Kuo-Yu Lu Shockproof caster
CN108032681A (en) * 2017-12-29 2018-05-15 新乡市亿龙养护设备有限公司 A kind of road sweeper avoidance universal wheel
US11975568B2 (en) * 2020-01-24 2024-05-07 Gatekeeper Systems, Inc. Self-adjusting caster assemblies
US11547618B2 (en) * 2020-06-02 2023-01-10 Toyota Motor North America, Inc. Support devices including collapsible casters
CN114129365A (en) * 2021-11-15 2022-03-04 湖南辰康医药有限公司 Medical truckle support for medical sickbed

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